A. more inclined when moving
B. less inclined when moving
C. more inclined when standing
D. less inclined when standing
✅ The correct answer is option D.
Strength of Materials MCQs
If a rigid body is in equilibrium under the action of three forces, then_______________?
A. these forces are equal
B. the lines of action of these forces meet in a point
C. the lines of action of these forces are parallel
D. B. and C. above
✅ The correct answer is option D.
The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be______________?
A. r/2
B. 2r/3
C. r/A
D. 3r/2
✅ The correct answer is option D.
Which of the following is the example of lever of first order________________?
A. arm of man
B. pair of scissors
C. pair of clinical tongs
D. all of the above
✅ The correct answer is option D.
The C.G. of a solid hemisphere lies on the central radius 3r_______________?
A. at distance — from the plane base 3r
B. at distance — from the plane base 3r
C. at distance — from the plane base 3r
D. at distance — from the plane base or
✅ The correct answer is option D.
The effort required to lift a load W on a screw jack with helix angle a and angle of friction
A. Wtan(a + )
B. Wtan(a-)
C. Wcos(a + )
D. Wsin(a + )
✅ The correct answer is option A.
Coefficient of friction is the__________________?
A. angle between normal reaction and the resultant of normal reaction and the limiting friction
B. ratio of limiting friction and normal reaction
C. the friction force acting when the body is just about to move
D. the friction force acting when the body is in motion
✅ The correct answer is option B.
A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if______________?
A. the floor is smooth, the wall is rough
B. the floor is rough, the wall is smooth
C. the floor and wall both are smooth surfaces
D. the floor and wall both are rough sur-faces
✅ The correct answer is option C.
Coulomb friction is the friction between_________________?
A. bodies having relative motion
B. two dry surfaces
C. two lubricated surfaces
D. solids and liquids
✅ The correct answer is option A.
A single force and a couple acting in the same plane upon a rigid body________________?
A. balance each other
B. cannot balance each other
C. produce moment of a couple
D. are equivalent
✅ The correct answer is option B.